antagonism
argumentation
atonalism
atonality
cacophony
clashing
clinker
conflict
contention
contradiction
contrariety
contrast
controversy
departure
deviation
difference
disaccord
disaccordance
disagreement
disconformity
discongruity
discord
discordance
discordancy
discrepancy
discreteness
disharmony
disparity
dissension
dissent
dissidence
dissimilarity
dissonancy
dissonant chord
distinction
distinctness
disunion
disunity
divergence
divergency
diversity
faction
far cry
flatness
heterogeneity
inaccordance
incompatibility
incongruity
auditory sensation
sound
cackle
counterpoint
dissonances
inharmony
jangle